arch/h8300/kernel/traps.c

   1 /*
   2  * linux/arch/h8300/boot/traps.c -- general exception handling code
   3  * H8/300 support Yoshinori Sato <ysato@users.sourceforge.jp>
   4  *
   5  * Cloned from Linux/m68k.
   6  *
   7  * No original Copyright holder listed,
   8  * Probable original (C) Roman Zippel (assigned DJD, 1999)
   9  *
  10  * Copyright 1999-2000 D. Jeff Dionne, <jeff@rt-control.com>
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file COPYING in the main directory of this archive
  14  * for more details.
  15  */
  16
  17 #include <linux/types.h>
  18 #include <linux/sched.h>
  19 #include <linux/sched/debug.h>
  20 #include <linux/mm_types.h>
  21 #include <linux/kernel.h>
  22 #include <linux/errno.h>
  23 #include <linux/init.h>
  24 #include <linux/module.h>
  25 #include <linux/bug.h>
  26
  27 #include <asm/irq.h>
  28 #include <asm/traps.h>
  29 #include <asm/page.h>
  30
  31 static DEFINE_SPINLOCK(die_lock);
  32
  33 /*
  34  * this must be called very early as the kernel might
  35  * use some instruction that are emulated on the 060
  36  */
  37
  38 void __init base_trap_init(void)
  39 {
  40 }
  41
  42 void __init trap_init(void)
  43 {
  44 }
  45
  46 asmlinkage void set_esp0(unsigned long ssp)
  47 {
  48         current->thread.esp0 = ssp;
  49 }
  50
  51 /*
  52  *      Generic dumping code. Used for panic and debug.
  53  */
  54
  55 static void dump(struct pt_regs *fp)
  56 {
  57         unsigned long   *sp;
  58         unsigned char   *tp;
  59         int             i;
  60
  61         pr_info("\nCURRENT PROCESS:\n\n");
  62         pr_info("COMM=%s PID=%d\n", current->comm, current->pid);
  63         if (current->mm) {
  64                 pr_info("TEXT=%08x-%08x DATA=%08x-%08x BSS=%08x-%08x\n",
  65                         (int) current->mm->start_code,
  66                         (int) current->mm->end_code,
  67                         (int) current->mm->start_data,
  68                         (int) current->mm->end_data,
  69                         (int) current->mm->end_data,
  70                         (int) current->mm->brk);
  71                 pr_info("USER-STACK=%08x  KERNEL-STACK=%08lx\n\n",
  72                         (int) current->mm->start_stack,
  73                         (int) PAGE_SIZE+(unsigned long)current);
  74         }
  75
  76         show_regs(fp);
  77         pr_info("\nCODE:");
  78         tp = ((unsigned char *) fp->pc) - 0x20;
  79         for (sp = (unsigned long *) tp, i = 0; (i < 0x40);  i += 4) {
  80                 if ((i % 0x10) == 0)
  81                         pr_info("\n%08x: ", (int) (tp + i));
  82                 pr_info("%08x ", (int) *sp++);
  83         }
  84         pr_info("\n");
  85
  86         pr_info("\nKERNEL STACK:");
  87         tp = ((unsigned char *) fp) - 0x40;
  88         for (sp = (unsigned long *) tp, i = 0; (i < 0xc0); i += 4) {
  89                 if ((i % 0x10) == 0)
  90                         pr_info("\n%08x: ", (int) (tp + i));
  91                 pr_info("%08x ", (int) *sp++);
  92         }
  93         pr_info("\n");
  94         if (STACK_MAGIC != *(unsigned long *)((unsigned long)current+PAGE_SIZE))
  95                 pr_info("(Possibly corrupted stack page??)\n");
  96
  97         pr_info("\n\n");
  98 }
  99
 100 void die(const char *str, struct pt_regs *fp, unsigned long err)
 101 {
 102         static int diecount;
 103
 104         oops_enter();
 105
 106         console_verbose();
 107         spin_lock_irq(&die_lock);
 108         report_bug(fp->pc, fp);
 109         pr_crit("%s: %04lx [#%d] ", str, err & 0xffff, ++diecount);
 110         dump(fp);
 111
 112         spin_unlock_irq(&die_lock);
 113         do_exit(SIGSEGV);
 114 }
 115
 116 static int kstack_depth_to_print = 24;
 117
 118 void show_stack(struct task_struct *task, unsigned long *esp, const char *loglvl)
 119 {
 120         unsigned long *stack,  addr;
 121         int i;
 122
 123         if (esp == NULL)
 124                 esp = (unsigned long *) &esp;
 125
 126         stack = esp;
 127
 128         printk("%sStack from %08lx:", loglvl, (unsigned long)stack);
 129         for (i = 0; i < kstack_depth_to_print; i++) {
 130                 if (((unsigned long)stack & (THREAD_SIZE - 1)) >=
 131                     THREAD_SIZE-4)
 132                         break;
 133                 if (i % 8 == 0)
 134                         printk("%s ", loglvl);
 135                 pr_cont(" %08lx", *stack++);
 136         }
 137
 138         printk("%s\nCall Trace:\n", loglvl);
 139         i = 0;
 140         stack = esp;
 141         while (((unsigned long)stack & (THREAD_SIZE - 1)) < THREAD_SIZE-4) {
 142                 addr = *stack++;
 143                 /*
 144                  * If the address is either in the text segment of the
 145                  * kernel, or in the region which contains vmalloc'ed
 146                  * memory, it *may* be the address of a calling
 147                  * routine; if so, print it so that someone tracing
 148                  * down the cause of the crash will be able to figure
 149                  * out the call path that was taken.
 150                  */
 151                 if (check_kernel_text(addr)) {
 152                         if (i % 4 == 0)
 153                                 printk("%s       ", loglvl);
 154                         pr_cont(" [<%08lx>]", addr);
 155                         i++;
 156                 }
 157         }
 158         printk("%s\n", loglvl);
 159 }